Why then do so many original Capeskin A-1 & 37J1 jackets not display this vital characteristic? They are generally pretty smooth.
They do have it, but the quality of the pictures is not so good to see them.
I suggest watching "Only Angels Have Wings" with Cary Grant. You will not be able to see them. But in the photo I posted earlier you can see them because it's a better resolution image.
I further suggest looking for A-1 photos in photo databases like Getty images that store high resolution photo. There you will be able to see them.